The Output-voltage-ripple Analysis of Dual Active Bridge Converter Based on a Novel Ripple Recovery Technique

This paper proposes a novel ripple recovery technique for the dual active bridge (DAB) converter. The proposed technique reveals the limitation of the conventional discrete-time modeling method in the output-voltage-ripple analysis of the DAB converter. Two previously unrecognized output voltage states are recovered by the ripple recovery technique, which can reveal the detailed information of the output voltage. The output-voltage-ripple analysis under different parameters can be utilized to discover the key parameters to the output voltage ripple. Besides, the parameter borders under different ripple requirement are obtained, which can give a guidance for the practical parameter design. Finally, the simulation and theoretical analysis are verified by the experimental results.